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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afa193cd1e6307c58ec29780ceaa260c7e6dab09f080eafe68692654b671d40' 
  AND token = 'H0Zf2q/Vz5n4b4B+rXyjmbKV3OjNRaUJrdYmmp5A5+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}